Improved broadband and omnidirectional light absorption in silicon nanopillars achieved through gradient mesoporosity induced leaky waveguide modulation

Karadan, Prajith; Anappara, Aji A.; Moorthy, V H S; Narayana, Chandrabhas; Barshilia, Harish C.

doi:10.1039/c6ra20467h

Cited by 15 publications

(15 citation statements)

References 29 publications

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“…broadband absorption over a wide AOI range was demonstrated with NP arrays using a mesoporosity which supports the formation of leaky waveguide modes, [40] and experimental verification supported the suppression of Fresnel reflections over a wide spectral range and AOI up to 70 for both polarizations. [41] Also, this omnidirectional and broadband response was demonstrated for silicon NP arrays of various crystallographic planes.…”

Section: Introductionmentioning

confidence: 61%

Broadband and Omnidirectional Antireflection Surfaces Based on Deep Subwavelength Features for Harvesting of the Solar Energy

et al. 2021

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Section: Introductionmentioning

confidence: 61%

Broadband and Omnidirectional Antireflection Surfaces Based on Deep Subwavelength Features for Harvesting of the Solar Energy

et al. 2021

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“…The ultra sensitivity of SiNPLs-SERS sensor is strongly believed to be due to electromagnetic coupling effect of SiNPLs and AgNPs. The fundamental light coupling property of the SiNPLs has been discussed in our recent publication [41].…”

Section: Resultsmentioning

confidence: 99%

Tailored periodic Si nanopillar based architectures as highly sensitive universal SERS biosensing platform

Karadan

Aggarwal

Anappara

et al. 2018

Sensors and Actuators B: Chemical

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We report a skeleton key platform for surface enhanced Raman spectroscopy (SERS) based biosensor, utilizing ordered arrays of Si nanopillars (SiNPLs) with plasmonic silver nanoparticles (AgNPs). The optimized SiNPLs based SERS (SiNPLs-SERS) sensor exhibited high enhancement factor (EF) of 2.4 × 10 8 for thiophenol with sensitivity down to 10 −13 M of R6G molecules. The ordered array of SiNPLs stabilizes the distribution of AgNPs along with the light trapping properties, which resulted in high EF and excellent reproducibility. The uniformity in the arrangement of AgNPs makes a single SiNPLs-SERS substrate to work for all types of biomolecules such as positively and negatively charged proteins, hydrophobic proteins, cells and dyes, etc. The experiments conducted on differently charged proteins, amyloid beta (the protein responsible for alzheimers), E. coli cells, healthy and malaria infected RBCs provide a proof of concept for employing universal SiNPLs-SERS substrate for trace biomolecule detection. The FDTD simulations substantiate the superior performance of the sensor achieved by the tremendous increase in the hotspot distribution compared to the bare Si sensor.

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“…In MACE, the geometry of the SiNWs is controlled by regulating the metal coverage area, substrate orientation and etchant composition 10,11 . Inhomogeneous porosity developed on the SiNWs is a unique feature of the MACE, which increases the surface area and generates a gradient refractive index structure on the nanowires 12 …”

Section: Introductionmentioning

confidence: 99%

Improved omnidirectional polarisation‐insensitive optical absorption and photoelectrochemical water splitting using aperiodic and tapered slanted, kinked and straight silicon nanowires

Khatun

Roy

et al. 2022

Intl J of Energy Research

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We have experimentally demonstrated that slanted, kinked and straight silicon nanowire arrays form a broadband omnidirectional light-harvesting structure.The unique design of kinked and slanted nanowires allows them to trap more light effectively across a wide wavelength range than straight silicon nanowires (SiNWs). We report that the light absorption in slanted, kinked and straight wires is enhanced by controlling their geometrical parameters. The p-type SiNWs have less reflection than n-type SiNWs due to their larger porosity gradient structure. Aperiodic and tapered slanted, kinked and straight SiNWs are remarkably photoactive and promising low-cost materials for photoelectrochemical water splitting applications.

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Improved broadband and omnidirectional light absorption in silicon nanopillars achieved through gradient mesoporosity induced leaky waveguide modulation

Abstract: Omnidirectional and polarization insensitive light coupling through mesoporosity induced waveguiding in Si nanopillars, fabricated by metal assisted chemical etching and nanosphere lithography.

Cited by 15 publications

References 29 publications

Broadband and Omnidirectional Antireflection Surfaces Based on Deep Subwavelength Features for Harvesting of the Solar Energy

Broadband and Omnidirectional Antireflection Surfaces Based on Deep Subwavelength Features for Harvesting of the Solar Energy

Tailored periodic Si nanopillar based architectures as highly sensitive universal SERS biosensing platform

Improved omnidirectional polarisation‐insensitive optical absorption and photoelectrochemical water splitting using aperiodic and tapered slanted, kinked and straight silicon nanowires

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